531181979 has 2 divisors, whose sum is σ = 531181980. Its totient is φ = 531181978.

The previous prime is 531181969. The next prime is 531181997. The reversal of 531181979 is 979181135.

Together with next prime (531181997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531181979 - 2⁸ = 531181723 is a prime.

It is not a weakly prime, because it can be changed into another prime (531181909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265590989 + 265590990.

It is an arithmetic number, because the mean of its divisors is an integer number (265590990).

Almost surely, 2^531181979 is an apocalyptic number.

531181979 is a deficient number, since it is larger than the sum of its proper divisors (1).

531181979 is an equidigital number, since it uses as much as digits as its factorization.

531181979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 44.

The square root of 531181979 is about 23047.3855133288. The cubic root of 531181979 is about 809.8683823131.

The spelling of 531181979 in words is "five hundred thirty-one million, one hundred eighty-one thousand, nine hundred seventy-nine".